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You say this is a PoS (I'm assuming you mean Point of Sale and not Piece of S**t).

A previous job of mine was a manager at a new start-up resturant. I worked closely with the PoS guys, so if something went wrong I could fix it on the spot.

Through this, I became very familiar with PoS's.

If there is any thousandth's decimal, most, if not all, PoS's will always round up - why? Money. Those fractions of a penny add up after a full day of sales. So if it didn't round up, the business could potential take a big hit, think 200 orders a day, each with .004 cents cut from that is .80 cents. .80 cents a day is $292 dollars a year - and that's thinking very conservatively.

For example, have you ever seen Office Space? It is the same principal.

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Now as for your question, I'm not completely sure what you are asking...